Process of soldering ornamental and other chains and chain mail of wire of solid cross section



r 25 water) "and cleaned whereupon they 50 be deposited. Q

Patented June 24,1930

7 rum-T D STATES P TENT; @oF 1cs]..:* 1f a nrmimns MEYLEIN, orrroRzHmi/r, GERMANY 7 PROCESS or SOLDERING ORNAMENTAL AND OTHERCI-IAINS'AND CHAIN- MAIL'O F' Winn or so'LIncRoss SECTION" ,Zl ToDrawing Application filed 'septemb er 1926, Serial No. 138,110 and inGermany September 27,1925.

;This invention relates to a process of soldering ornamentalw other chans and chain-mail of wireof solid cross section.

The invention has for 'its'object to simplify considerably .themanufacturing offchains and chain mail soldered mechanic'ally' incontinuous operation.

Chains or chain mall are produced at present in such a manner that a socalled solder wire, 1. e. a wire having a core of solder is heated, orthat onto the ring blanks made from wire of solid crosssectioningalvanic baths by means of electric current a coating of oneorseveral metals is deposited said coating being subsequently madeliquid by heating. 7 7 V In the process according tothe invention 1 ringblanks of wire of solid crosssection are used. The process is as followsThe ring blanks of wireof solid tionare thoroughly freed from fat bymeans of chromic acid in combination with sulphuric acid and water (40grs'. chromic acid and 40 grs. sulphuric acid in 1 liter of are dippedfor a short time into the solution of a simple or complex salt of ametal which is electronegative to a. higher degree than the metalof'which the chain or chain mail is made. A portionof chain or chainmail is boiled with so much distilled water that the chain or chain mailis covered by the water, whereupon for each kilogram of chain or chainmail grs. of cyanide silver alkaline and for each liter of water 20 grs.

potassium cyanide are added; I g

The chain or the chain mail is coated during the dipping with a verythin layer of the 'dissolvedmetal said layer beingmuch thin- I 7 4O neras'if it were produced by depositing by means of the electric current.This thin layer is quite sufiicient to perfectly solder the joints ofthe ring blanks at subsequent heating. Experiments haveproved that thedippingprocess according to the invention is superior to the galvanicprocess.

cross sec- 7 As examplesbmay be. mentioned: Onto iron as base metalcopper is deposited;

Onto copper as base metal silver is de osited. Onto" silver as basemetal :gol is deposited. a

The coating produced .by thefdipplngis I very thin and much below 1%.Part of the invention, consists in the knowledge that the littlequantity of metal which is deposited by the dipping process is quitesufficient-for the soldering.

I claim 1; A process of soldering ornamental or similar chains andchainmail of wire. of

solid cross section, consisting in thoroughly freeing from; fat with theaid'of chromic. acid incombinationwith sulphuric acid, and

Water the ring blanks hooked the one in the other, in cleaning thering'blanks thus treated, in dipping the same for a short.

time into the solution of a simple salt of such a metal whichis moreelectronegative than the'metal'ofewhich the chain or chain 5 mail ismade, and in heating the'chain or metal to bring about alloying of the,two metals and soldering of the link joints.

2. 'A process of soldering ornamentalor similar chains and chain mail ofwire of solid cross section, conslstlng 1n thoroughly chain mailthuscoated to fuse the coating 5 freeing from fat with the aid of'chromic acid in combination withsulphuric acid and water the ringblankshooked the one inthe other, in cleaning the rin blanks thustreated, in dipping the same for a short time into the solution of acomplex saltiofsuch a I C metal which is more electronegative than a Forthe dipping processaccording to the invention the metal which causes'thedepositing must be less precious than the metal to ioo

